although most people choose to remove all traces of the old paint , YOU DONT HAVE TO , there is a product available through most repaint factors thats called BARCOAT , comes in litre sized tins and is ready to spray onto the surface thats reacted , what i tend to do is smooth down the origanal finish then spray this product over the whole job thats being painted , once dry but without rubbing down any further proceed in applying the new paint ! the barcoat seals in the old finish and stops it reacting with whatever you are useing now ! ive had cause to use it many times & its always saved stripping the old paint . hope this helps . jon
